KR20220142352A - Burner and water heating apparatus including same - Google Patents

Abstract

The present invention provides a burner for a water heater with improved combustibility. According to the present invention, the burner for a water heater is positioned upstream of a combustion chamber in a reference direction which is the flow direction of combustion gas produced by a combustion reaction and includes a distribution plate of a plate shape to cause the combustion reaction. When one direction perpendicular to the reference direction is a longitudinal direction and the direction perpendicular to the longitudinal direction and the reference direction is a width direction, a plurality of penetration holes formed through the distribution plate in the longitudinal direction are separated to be arranged in the width direction and the longitudinal direction to move a mixture of fuel and air for the combustion reaction through the penetration holes. The distribution plate includes a middle portion which is a portion positioned in the middle in the width direction, and an edge portion positioned on both sides of the middle portion. The penetration density obtained by dividing the sum of the areas of the penetration holes positioned on the edge portion by the area of the edge portion is smaller than the penetration density obtained by dividing the sum of the areas of the penetration holes positioned on the middle portion by the area of the middle portion.

Description

BURNER AND WATER HEATING APPARATUS INCLUDING SAME

The present invention relates to a burner and a water heater comprising the same.

A water heater is a device that transfers heat generated by combustion reaction to water and uses it for heating or hot water supply. Water is introduced, and the process of heating and discharging the introduced water is performed through a water heater.

A combustion reaction can occur in a burner, and in order for a burner to cause a combustion reaction, fuel is required. As the fuel passes through the through hole formed in the burner, it has a good condition to form a flame, and ignition may occur and a flame may be generated along with the combustion reaction.

The heat generated by the burner is used to heat the water, but in the process, it transfers excessive heat to the other components that make up the water heater, which may deform or break the other components, preventing them from performing their functions. In particular, since the edge of the flame generated from the burner spreads out, the inner wall of the combustion chamber may be excessively heated, which inhibits combustibility and leads to incomplete combustion, and excessive carbon monoxide may be generated during the combustion reaction in the burner. As incomplete combustion occurs, the thermal efficiency of the water heater may be impaired.

The present invention has been devised to solve such problems, and an object of the present invention is to provide a burner for a water heater with improved combustibility and a water heater including the same.

According to an embodiment of the present invention, a burner for a water heater positioned upstream of a combustion chamber with respect to a reference direction, which is a flow direction of combustion gas generated by a combustion reaction, includes a plate-shaped distribution plate for generating the combustion reaction. And, when one direction orthogonal to the reference direction is referred to as a longitudinal direction, and a direction orthogonal to the reference direction and the longitudinal direction is referred to as a width direction, the distribution plate allows the mixture of fuel and air for the combustion reaction to pass through. A plurality of through-holes that are formed to penetrate in the reference direction are disposed to be spaced apart along the longitudinal direction and the width direction, and the distribution plate includes a central portion, which is a portion located at the center with respect to the width direction, and the center including the outer portions located on both sides of the portion, and the penetration density obtained by dividing the sum of the areas of the through holes located in the outer portion by the area of the outer portion is the sum of the areas of the through holes located in the central portion is the central portion less than the penetration density divided by the area of .

A water heater according to an embodiment of the present invention comprises: a burner having a mixing chamber in which fuel and air are mixed to produce a mixture, and a plate-shaped distribution plate provided to cause a combustion reaction by ejecting the mixture; a combustion chamber provided so that a flame generated by the combustion reaction is located therein; a heat exchanger for heating water using heat generated by the combustion reaction; and a combustion chamber insulation pipe provided to allow water to flow on the outside of the combustion chamber for thermal insulation of the combustion chamber, wherein a direction in which the combustion gas generated by the combustion reaction flows is referred to as a reference direction, and is orthogonal to the reference direction When one direction is referred to as a longitudinal direction and a direction perpendicular to the reference direction and the longitudinal direction is referred to as a width direction, a plurality of through holes formed by penetrating the distribution plate along the reference direction so that the mixture passes through the length The distribution plate is disposed to be spaced apart along the width direction and the width direction, and the distribution plate includes a central portion that is a central portion with respect to the width direction, and an outer portion located on both sides of the central portion, The through-hole formed is, based on the width direction, the outer end of the flame formed by the mixture passing through the through-hole disposed in the outer portion is inward than a portion of the side wall of the combustion chamber in contact with the combustion chamber heat insulation pipe. placed to be located.

Accordingly, the burner's combustibility is improved so that incomplete combustion and a combustion reaction in which the production of carbon monoxide, which is a product thereof, is reduced is possible.

1 is a perspective view showing a water heater according to a first embodiment of the present invention.
2 is a view showing a part of a longitudinal section of the water heater according to the first embodiment of the present invention.
3 is a view showing a shape of a distribution plate of a burner having a through-hole formed according to the first embodiment of the present invention.
4 is a view showing the shape of the distribution plate of the burner according to the second embodiment of the present invention.
5 is a view showing the shape of the distribution plate of the burner according to the third embodiment of the present invention.
6 is a view showing the shape of the distribution plate of the burner according to the fourth embodiment of the present invention.
7 is a view showing the shape of the distribution plate of the burner according to the fifth embodiment of the present invention.
8 is a view showing a shape in which the bracket engaging portion of the burner frame according to the sixth embodiment of the present invention covers the distribution plate.
9 is a view showing a shape in which the shielding plate covers the distribution plate according to the seventh embodiment of the present invention.
10 is a view showing a flame shape generated in a burner using an exemplary distribution plate.
11 is a view showing the shape of a flame generated in the burner according to the first embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but between each component another component It will be understood that may also be "connected", "coupled" or "connected".

1 is a perspective view showing a water heater 1 according to a first embodiment of the present invention. 2 is a view showing a part of a longitudinal section of the water heater 1 according to the first embodiment of the present invention.

The direction in which the combustion gas generated by the combustion reaction flows is referred to as a reference direction (D1), one direction orthogonal to the reference direction (D1) is referred to as a longitudinal direction (D3), and the reference direction (D1) and the longitudinal direction (D3) are referred to as the reference direction (D1). ) and the direction orthogonal to the width direction (D2).

Each component may be arranged along the reference direction D1. Here, the reference direction D1 may be downward. In this specification, the reference direction (D1), the width direction (D2), and the length direction (D3) are referred to for convenience of description. This direction can be determined relative to the direction in which the water heater 1 is arranged.

The water heater 1 according to the first embodiment of the present invention may have a burner 10 , a combustion chamber 20 , and heat exchangers 30 and 40 in order along the reference direction D1 . Accordingly, the combustion gas generated from the burner 10 may flow downward and be discharged through the combustion chamber 20 and the heat exchangers 30 and 40 . The heat exchangers 30 and 40 may include a latent heat heat exchanger 40 and a sensible heat heat exchanger 30 , and the sensible heat heat exchanger 30 may be disposed inside the combustion chamber 20 .

Combustion Chamber (20)

The water heater 1 according to the first embodiment of the present invention may include a combustion chamber 20 . A flame due to a combustion reaction generated from the burner 10 may be located inside the combustion chamber 20 . The combustion chamber 20 may be formed in the same shape as a box opened up and down, and the burner 10 is connected to the upstream side with respect to the reference direction D1, and the heat exchangers 30 and 40 may be connected to the downstream side. . Accordingly, combustion gas may be generated in the burner 10 and may be transferred to the sensible heat heat exchanger 30 and the latent heat heat exchanger 40 through the combustion chamber 20 .

The combustion chamber 20 may have a side wall 21 . The side wall 21 of the combustion chamber 20 may include two general side plates spaced apart from each other along the longitudinal direction D3 and two heat insulating side plates spaced apart from each other along the width direction D2. The combustion space 200 may be formed by combining the general side plate and the heat insulating side plate with each other. A flow path cap plate 22 having a flow path cap that is a portion protruding to the outside of the combustion chamber 20 may be coupled to the outside of the general side plate along the longitudinal direction D3, respectively. Therefore, a space for water to flow is formed between the general side plate and the flow path cap, and this space is communicated with adjacent heat insulating pipes or sensible heat heat exchange pipes 32 that will be described later, and the heat insulating flow path composed of heat insulating pipes. Alternatively, it may form a part of the sensible heat flow path composed of the sensible heat heat exchange pipes 32 .

Heat Exchanger (30, 40)

The heat exchangers 30 and 40 heat water using heat generated by the combustion reaction. The heat exchangers 30 and 40 may be divided into a sensible heat heat exchanger 30 and a latent heat heat exchanger 40 according to which heat is used.

The heat exchangers 30 and 40 may have a housing 70 . The housing 70 of the heat exchangers 30 and 40 includes two heat exchange general side plates 71 spaced apart from each other along the longitudinal direction D3 and two heat exchange heat insulating side plates 72 spaced apart from each other along the width direction D2. ) may be included. The heat exchange general side plate 71 and the heat exchange heat insulation side plate 72 are coupled to each other to form an inner space of the housing 70 . A heat exchange flow path cap plate having a flow path cap protruding to the outside of the heat exchangers 30 and 40 may be coupled to the outside of the general heat exchange side plate 71 in the longitudinal direction D3, respectively. Accordingly, a space for water to flow is formed between the heat exchange general side plate 71 and the flow path cap, and the space is formed between adjacent sensible heat insulation pipes 52 , adjacent sensible heat heat exchange pipes 32 , and latent heat heat exchange adjacent to each other. It may communicate with at least one of the pipes to form at least one of a portion of the sensible heat flow path composed of the sensible heat heat exchange pipes 32 and a portion of the latent heat flow path composed of the latent heat heat exchange pipes.

At least a portion of the sensible heat exchanger 30 may be inserted into the combustion chamber 20 . A sensible heat exchanger 30 may be disposed inside the combustion chamber 20 . Therefore, the sensible heat fin 31 to be described later may contact the inner surface of the combustion chamber 20 . The sensible heat exchanger 30 may be disposed below the combustion space 200 which is an internal space of the combustion chamber 20 . A flame by the burner 10 may be positioned above the combustion space 200 .

The water heater 1 according to the first embodiment of the present invention may include an insulating pipe 50 , and the insulating pipe 50 may include a combustion chamber insulating pipe 51 . The heat insulating pipe 50 may include a sensible heat insulating pipe 52 . The sensible heat insulation pipe 52 may be disposed adjacent to the outside of the heat insulation side plate in the width direction D2. Water flows from the inside of the heat insulation pipe 50 to insulate the combustion chamber 20 and the sensible heat heat exchanger 30 . The combustion chamber insulation pipe 51 may insulate the combustion chamber 20 , and the sensible heat insulation pipe 52 may insulate the sensible heat heat exchanger 30 . The heat insulating pipe 50 may include a latent heat insulating pipe disposed adjacent to the latent heat heat exchanger 40 from the outside of the latent heat heat exchanger 40 . Water flows inside the latent heat insulation pipe to insulate the latent heat heat exchanger 40 .

The sensible heat insulation pipe 52 may be disposed adjacent to the sensible heat heat exchanger 30 . However, since the sensible heat insulating pipe 52 is in contact with the outer surface of the heat exchange insulating side plate 72, the sensible heat insulating pipe 52 is disposed in a position opposite to the sensible heat heat exchanger 30 with the heat exchange insulating side plate 72 as the center. can be To enable this arrangement, a portion of the sensible heat insulation pipe 52 is vertically aligned to overlap the sensible heat heat exchanger 30 with respect to the width direction D2 in a cross section cut in a plane perpendicular to the longitudinal direction D3. It may be disposed at a height similar to that of the sensible heat exchanger 30 based on the .

The sensible heat exchanger 30 is provided to receive heat generated by the combustion reaction generated in the burner 10 to heat the water flowing through the inside. Although the sensible heat exchanger 30 according to an embodiment of the present invention is described as a fin tube type heat exchanger, other types of heat exchangers such as a plate type heat exchanger may be used as the sensible heat heat exchanger.

The sensible heat exchanger 30 may include a sensible heat heat exchange pipe 32 and a sensible heat fin 31 . The sensible heat heat exchange pipe 32 is a pipe provided to receive heat generated by the combustion reaction and heat water flowing through the inside. Water flows into the inside of the sensible heat heat exchange pipe 32 , and the combustion gas flows around the sensible heat heat exchange pipe 32 to exchange heat through the sensible heat heat exchange pipe 32 .

The sensible heat exchange pipe 32 may extend along the longitudinal direction D3 and may be arranged along the width direction D2. Both ends of the sensible heat heat exchange pipe 32 may communicate with the space formed by the flow path cap as described above to form a sensible heat flow path. Among the sensible heat heat exchange pipes 32 , one of the sensible heat heat exchange pipes 32 located at both ends along the width direction D2 is connected to the latent heat heat exchanger 40 to become an inlet of the sensible heat flow path, and the other is a sensible heat insulation pipe It may be connected to (52) to be the exit of the sensible heat flow path.

In a cross-section in which the sensible heat heat exchange pipe 32 is cut in a plane perpendicular to the longitudinal direction D3 in which the sensible heat heat exchange pipe 32 is extended, the shape of the internal space of the sensible heat heat exchange pipe 32 is a long hole extending along the vertical direction may be in the form of The internal space of the sensible heat heat exchange pipe 32 may have a shape in which a value obtained by dividing the length in the vertical direction in the cross section by the width in the width direction D2 is 2 or more.

The sensible heat fin 31 may be formed in a plate shape orthogonal to the direction in which the sensible heat heat exchange pipe 32 extends. The sensible heat fins 31 may be plural, and may be penetrated by the sensible heat heat exchange pipe 32 . By using the sensible heat fins 31 , the sensible heat heat exchanger 30 can expand the heat transfer area.

The upper portion of the sensible heat fin 31 may be formed along the circumference of the sensible heat heat exchange pipe 32 and protrude upward. In the lower portion of the sensible heat fin 31, an open louver hole along the longitudinal direction D3 and a louver protruding from the periphery of the louver hole along the longitudinal direction D3 are formed to control the flow of combustion gas around the sensible heat heat exchange pipe 32. can be guided by

The sensible heat insulating pipe 52 may be connected to the combustion chamber insulating pipe 51 to connect the sensible heat flow path to the combustion chamber flow path formed by the combustion chamber insulating pipes 51 . However, the sensible heat heat exchange pipe 32 and the combustion chamber heat insulation pipe 51 may be directly connected to the combustion chamber flow path and the sensible heat flow path.

The latent heat heat exchanger 40 is disposed on the downstream side of the sensible heat heat exchanger 30 with respect to the reference direction D1, and heats water flowing through the interior by using the latent heat of the combustion gas that is generated by the combustion reaction and flows. arranged to do The combustion gas may be transferred to the latent heat heat exchanger 40 through the sensible heat heat exchanger 30 . Water may be heated first in the latent heat heat exchanger 40 , and secondarily heated by the sensible heat heat exchanger 30 . Accordingly, the heat exchange pipe included in the latent heat heat exchanger 40 may communicate with the sensible heat heat exchange pipe 32 of the sensible heat heat exchanger 30 to transfer heated water to the sensible heat heat exchanger 30 .

The latent heat heat exchanger 40 may be a plate heat exchanger formed by stacking a plurality of latent heat plates, and similarly to the sensible heat heat exchanger 30, it may be a fin tube type heat exchanger including a heat exchange pipe and a fin penetrated by the heat exchange pipe. However, the type is not limited thereto.

Water may be delivered to a heating pipe located at a heating target that requires external heating of the water heater 1 to provide heating. After transferring heat to the heating object, a closed circuit in which water returns to the water heater 1 and circulates may be formed. In addition, the water may be transferred to the hot water heat exchanger by a circulation pipe and used to generate hot water.

The combustion chamber heat insulation pipe 51 may be configured in plurality. A plurality of combustion chamber insulation pipes may be disposed adjacent to the left and right sides of the combustion chamber 20 in FIG. 2 and spaced apart vertically. In the drawing, a total of four combustion chamber insulation pipes 51 are disposed, two on the left side of the combustion chamber 20 are vertically spaced apart from each other, and two on the right side of the combustion chamber 20 are shown as being vertically spaced apart from each other. did.

The lower end of the combustion chamber heat insulating pipe 51 located at the lowermost side among the combustion chamber heat insulating pipes 51 may be located above the upper end of the sensible heat fin 31 included in the sensible heat heat exchanger 30 . In this case, the distance from the lower end of the burner 10 to the upper end of the sensible heat fin 31 may be 80 mm or more and 85 mm or less. Through such a configuration, the quenching phenomenon of carbon monoxide can be reduced.

The quenching phenomenon of carbon monoxide means that carbon monoxide generated through combustion meets oxygen in a high-temperature region in the combustion chamber 20 and is not converted into carbon dioxide and is not discharged. refers to the emission phenomenon.

The combustion chamber insulation pipe 51 is in contact with the outer surface of the heat insulation side plate 212g of the combustion chamber, so that the combustion chamber 20 can be insulated. Heating water flows through the combustion chamber insulation pipe 51 to reduce the amount of heat generated by the combustion reaction transferred to the external region of the combustion chamber 20 through the side wall 21 .

A portion of the heat insulation side plate, which is a part of the side wall 21 to which the combustion chamber heat insulation pipe 51 is in contact, may have a shape convexly protruding inward to correspond to the exterior of the combustion chamber heat insulation pipe 51 . Therefore, the outer surface of the combustion chamber heat insulation pipe 51 can contact the heat insulation side plate over a wider area than the case where the heat insulation side plate is formed in a simple flat plate shape.

The combustion chamber flow path may include at least one of a portion formed in parallel and a portion formed in series. The combustion chamber passage through which water flows around the combustion space 200 to insulate it may be formed by connecting the passage cap formed on the passage cap plate 22 and the combustion chamber insulation pipe 51 .

Adapter(60)

The water heater 1 according to the first embodiment of the present invention may include an adapter 60 . The adapter 60 may connect the sensible heat flow path and the combustion chamber flow path. The adapter may connect the outlet of the sensible heat flow path and the inlet of the combustion chamber flow path. The outlet of the sensible heat flow path may be formed by one end of the sensible heat heat exchange pipe 32 as described above, or may be formed by one end of the sensible heat heat exchange pipe 32 and a flow cap connected thereto, or the sensible heat heat insulating pipe 52 One end of one may form. The inlet of the combustion chamber flow path may be formed by an end of one of the combustion chamber heat insulating pipes 51 , or may be formed by one end of the combustion chamber heat insulating pipe 51 and a flow path cap connected thereto.

The adapter 60 may be detachably coupled to the heating water outlet 33 and the combustion chamber supply port 23 . The heating water outlet 33 may be an outlet of the sensible heat flow path or an end of the sensible heat insulating pipe 52 . The combustion chamber supply port 23 is an inlet of the combustion chamber flow path. The heating water outlet 33 and the combustion chamber supply port 23 may have a shape protruding outward from the heat exchangers 30 and 40 and the combustion chamber 20, respectively. In order for the adapter 60 to be detachably coupled to the heating water outlet 33 and the combustion chamber supply port 23 , the heating water outlet 33 and the combustion chamber supply port 23 are connected to the water heater 1 with respect to the third direction. ) can be placed on the same side of the

The adapter 60 has an adapter heat exchanger part 61 and an adapter combustion chamber side part 62 that are connected to each other up and down, respectively, and as each is connected to the heating water outlet 33 and the combustion chamber supply port 23, the heating water outlet ( 33) and the combustion chamber supply port 23 may be connected to each other. The adapter heat exchanger part 61 may have an adapter heat exchanger-side connection part that is one end coupled to the heating water outlet 33 , and the adapter combustion chamber side part 62 includes an adapter combustion chamber-side connection part that is one end coupled to the combustion chamber supply port 23 . can have

The adapter 60 may include an adapter O-ring. The adapter O-ring is a member disposed between the adapter heat exchanger part 61 and the adapter combustion chamber side part 62 in a region where the adapter heat exchanger part 61 and the adapter combustion chamber side part 62 are connected, and has elasticity, so that the adapter heat exchanger part 61 has elasticity. It is possible to maintain watertightness between the and the adapter combustion chamber side portion 62 .

The adapter heat exchanger part 61 may be inserted into the adapter combustion chamber side part 62 and coupled thereto. When the heating water flows through the adapter 60, even if there occurs a situation in which watertightness cannot be maintained even by the adapter O-ring, this is to prevent the heating water from leaking.

An adapter clip is disposed at a portion where the adapter heat exchanger portion 61 and the adapter combustion chamber side portion 62 are coupled to each other, and the two portions may be pressed inwardly to be more firmly coupled. In addition, a separate clip is also disposed at a portion where the adapter 60 is coupled to each of the heating water outlet 33 and the combustion chamber supply port 23 to make the coupling more robust.

The adapter heat exchanger part 61 and the adapter combustion chamber side part 62 may have an 'L' shape bent. Therefore, the adapter 60 formed by combining the two members may be formed in an angled 'U' shape.

An elbow pipe other than the adapter 60 may be disposed to connect the heating water outlet 33 and the combustion chamber supply port 23 .

Side plate packing (82)

According to the first embodiment of the present invention, on the inside of the water heater (1), the side plate packing (82) disposed at a position between the sensible heat insulating pipe (52) and the combustion chamber insulating pipe (51), the water heater (1) Including, may be in contact with the inner surface of the housing (70). The side plate packing 82 may further extend toward the combustion chamber 20 to further contact the inner surface of the side wall 21 .

The area between the sensible heat insulating pipe 52 and the combustion chamber insulating pipe 51 is not insulated or cooled, so there is a risk of overheating. When the combustion chamber 20 is insulated using a heat insulating material, such an overheatable region may be covered by the heat insulating material, so that the risk of overheating may be relatively small. However, when the overheatable region is exposed as in the first embodiment of the present invention, discoloration may occur due to overheating. To prevent this, the side plate packing 82 may be placed and contacted in the overheatable area to prevent heat transfer to the housing 70 .

The water heater 1 may further include a packing bracket 81 . The packing bracket 81 is a bracket that sandwiches and supports the side plate packing 82 together with the inner surface of the housing 70 so that the side plate packing 82 comes into contact with the inner surface of the housing 70 . That is, the side plate packing 82 may be placed between the inner surface of the housing 70 and the packing bracket 81 . The end of the packing bracket 81 is inclined toward the inside of the combustion space 200 while going upward to guide the insertion of the side plate packing 82 into the space formed between the packing bracket 81 and the housing 70. can

The packing bracket 81 and the side plate packing 82 may meet the sensible heat insulation pipe 52 with the housing 70 interposed therebetween. The cooling of the packing bracket 81 indirectly contacting the sensible heat insulation pipe 52 can be made, thereby helping the side plate packing 82 to prevent heat transfer to the overheatable region.

Burner(10)

The burner 10 is provided to cause a combustion reaction from air and fuel. Accordingly, the burner 10 may include a mixing chamber 11 , a spark plug, a blower 14 , a fuel pump, a fixed frame 12 , and a distribution plate 13 .

The blower 14 is provided to operate by receiving electric power to pressurize air at a predetermined pressure. Accordingly, the blower 14 may include an impeller and a motor, but the components constituting the blower 14 are not limited thereto. The fuel pump may supply fuel by pressure to the mixing chamber 11 .

The mixing chamber 11 is a component that receives air from the blower 14 and receives fuel to provide a space for forming a mixture, and has an opening formed on the upstream side of the combustion chamber 20 along the reference direction D1. can be covered A fixing frame 12 having an opening in the center may be coupled to the downstream side of the mixing chamber 11 along the reference direction D1 . The fixed frame 12 may be positioned between the combustion chamber 20 and the mixing chamber 11 .

The fixed frame 12 may include a frame cover 121 . The fixed frame 12 may include a frame bracket 122 . The frame cover 121 may be fixed between the mixing chamber 11 and the combustion chamber 20 , and the frame cover 121 may cover the upper end of the combustion chamber 20 . The frame bracket 122 may be coupled to the frame cover 121 . A portion of the frame bracket 122 may be exposed into the combustion chamber 20 .

The frame bracket 122 may include a bracket fixing part 1221 . The bracket fixing part 1221 is located at the outermost side of the frame bracket 122 based on the width direction D2 and the length direction D3 , and may be coupled to the frame cover 121 . The bracket fixing part 1221 may be inserted and fixed inside the frame cover 121 . The bracket fixing part 1221 may be coupled to the frame cover 121 through a fastener. The bracket fixing part 1221 may be formed to extend in the width direction D2 and the length direction D3.

The frame bracket 122 may include a bracket connection part 1222 . The bracket connection part may connect the bracket fixing part 1221 and the bracket engaging part 1223 . The bracket connection part 1222 has a side surface extending in the reference direction (D1) and the longitudinal direction (D3), and a side surface extending in the reference direction (D1) and the width direction (D2), the inner end of the bracket fixing part 1221 and The outer end of the bracket engaging portion 1223 may be connected.

The frame bracket 122 may include a bracket engaging portion 1223 . A bracket engaging portion 1223 included in the burner frame 21 may be formed around the central opening. An outer portion of the distribution plate 13 may be coupled to the bracket engaging portion 1223 . The outer portion of the distribution plate 13 may mean both ends of the distribution plate 13 in the width direction (D2) and the length direction (D3). The bracket engaging portion 1223 may be formed to surround the combustion region formed on the distribution plate 13 . The bracket engaging part 1223 extends along the width direction D2 and the longitudinal direction D3, and the distribution plate 13 covers and closes the opening formed in the center of the bracket engaging part 1223. 13) may be fixed to the inside, and may extend obliquely in the middle direction between the width direction D2 and the length direction D3 and the reference direction D1.

When viewed from the combustion space 200, which is the internal space of the combustion chamber 20, in the opposite direction to the reference direction D1, the area formed around the distribution plate 13 is covered by the bracket engaging part 1223 and , at least part of the combustion zone is exposed. Therefore, a combustion region is formed from the outer point P1 located at the boundary between the inner end of the bracket engaging portion 1223 and the lower surface 221 of the distribution plate 13, and the flame accompanying the combustion reaction extends into the combustion space 200 can go out

A combustion reaction occurs on the surface located on the most downstream side of the distribution plate 13 with respect to the reference direction D1, and the flame spreads out. As such, it is assumed that a region in which a combustion reaction occurs among regions of the distribution plate 13 is referred to as a combustion region. In the combustion region, the mixture is combusted to generate a flame, and at other points of the distribution plate 13 other than the combustion region, the flame is generated and does not extend to the combustion space 200 . The combustion region may be provided so that the normal line N1 drawn at an arbitrary point in the combustion region does not contact the inner surface of the combustion chamber 20 . As shown, a combustion region may be provided so that the normal line N1 does not reach the side plate packing 82 . The normal line N1 drawn at any point in the combustion region may touch the upstream side of the heat exchangers 30 and 40 with respect to the reference direction D1 before contacting the inner surface of the combustion chamber 20 .

Here, when a virtual tangent plane is formed at a point existing in a combustion region formed as a curved surface, the normal N1 refers to a straight line that is orthogonal to the tangent plane and passes through the one point. As in the first embodiment of the present invention, in the case of a combustion region formed by extending a predetermined shape on a plane in a direction perpendicular to the plane, a tangent line drawn at an outer point P1 that is a point of the predetermined shape on the plane A straight line perpendicular to and passing through the point is the normal N1.

Since the normal line N1 drawn in the combustion area does not contact the inner surface of the combustion chamber 20, the flame formed in the combustion area does not touch the inner surface of the combustion chamber 20, or even if it does, it may have only a very weak effect. Accordingly, the amount of heat transmitted to the side plate of the combustion chamber 20 among the heat accompanying the flame is reduced, thereby preventing the combustion chamber 20 from being overheated.

As shown in the figure, the distribution plate 13 may be a curved surface in which a profile formed convexly along the reference direction D1 in one cross-section extends in a direction perpendicular to the one cross-section. A direction perpendicular to this one cross-section may be the longitudinal direction D3.

Due to the shape of the combustion region, the extending direction of the normal line N1 at any point in the combustion region will not change along the longitudinal direction D3, but will change along the width direction D2.

The combustion region may be provided so that the normal line N1 drawn at the outermost point P1 positioned on the outermost side with respect to the width direction D2 does not contact the inner surface of the combustion chamber 20 . Let θ be the magnitude of the acute angle formed by the straight line extending parallel to the reference direction D1 from the outer point P1 of the combustion region and the normal line N1 at the outer point P1. Let L be the distance from the outer point P1 where the normal line N1 is formed to the inner surface of the combustion chamber 20 along the width direction D2, and the outer side where the normal line N1 is formed along the reference direction D1 Let H be the distance from the point P1 to the point located on the most downstream side of the inner surface of the combustion chamber 20 . In this situation, the burner 10 may be provided so that the combustion region and the inner surface of the combustion chamber 20 satisfy Equation 1 below, which is an inequality.

While the first embodiment was described, the angle and length relationship of the normal N1 at the outer point P1 were described, but the burner 10 to satisfy the same inequality for any point other than the outer point P1. can be provided.

The spark plug is provided to ignite the mixture formed by the mixing of air and fuel in the mixing chamber 11 by sparking.

The distribution plate 13 is provided so that the ignited flame can be fixed. The distribution plate 13 may be formed in a plate shape. The mixture is ejected through the distribution plate 13 and a combustion reaction may occur. Both ends of the distribution plate 13 in the width direction (D2) and the length direction (D3) are coupled to the fixed frame 12 , so that the distribution plate 13 may be disposed to close the opening of the fixed frame 12 . . On the downstream side of the distribution plate 13 along the reference direction D1, a mat in which metal fibers are tightly woven so that the flame is fixed may be disposed.

3 is a view showing the shape of the distribution plate 13 of the burner 10 according to the first embodiment of the present invention.

A plurality of through holes 131 and 132 may be formed by passing the distribution plate 13 through the reference direction D1 so that the mixture passes. The plurality of through holes 131 and 132 may be disposed to be spaced apart from each other in the longitudinal direction D3 and the width direction D2 on the distribution plate 13 . The through holes 131 and 132 may be formed in a slit shape extending along the width direction D2. The through-holes 131 and 132 disposed at the same position along the width direction D2 and spaced apart at a predetermined interval along the longitudinal direction D3 may be bundled to form one through-hole row. A plurality of through-hole rows may be formed along the width direction D2. The through-holes 131 and 132 included in one through-hole row may have the same spacing, and the through-holes 131 and 132 included in different through-hole rows may have different spacings.

The distribution plate 13 includes a central portion A11, which is a portion located at the center with respect to the width direction D2, and an outer portion A12 located on both sides of the central portion A11. That is, the outer portion A12 may be divided into two portions divided by the central portion A11 . The through-holes 131 and 132 positioned at the outer portion A12 are referred to as the outer through-holes 132 , and the through-holes 131 and 132 positioned at the center portion A11 are referred to as the center through-holes 131 . The sum of the widths of the outer portion A12 in the width direction D2 may be less than or equal to the width of the central portion A11 .

The penetration density obtained by dividing the sum of the areas of the outer through-holes 132 by the area of the outer portion A12 may be smaller than the penetration density obtained by dividing the sum of the areas of the center through-holes 131 by the area of the center portion A11. . The penetration density of the outer portion A12 may be 70% or less of the penetration density of the central portion A11. Accordingly, the amount of the mixture passing through the distribution plate 13 is concentrated in the central portion A11 rather than the outer portion A12, so that a strong flame may be formed in the central portion A11.

The outer through-hole 132 is a combustion chamber 20 in which the outer end of the flame formed by the mixture passing through the outer through-hole 132 in the width direction D2 is in contact with the combustion chamber insulation pipe 51 . It may be disposed to be located inward than a portion of the sidewall 21 . That is, by reducing the size of the outer portion of the formed flame, the flame does not directly contact the combustion chamber insulation pipe 51 or the side wall 21 of the combustion chamber 20, thereby preventing overheating and incomplete combustion from occurring, and the flame This can be prevented from flying

The spacing between the rows of through-holes disposed in the central portion A11 and the spacing of the rows of through-holes disposed in the outer portion A12 may be different from each other. The distance between the central portion A11 and the outer portion A12 may be smaller than that of the outer portion A12 .

The outer through hole 132 may include an outer through hole 1321 disposed on the outermost side with respect to the width direction D2 and an inner through hole 1322 disposed on the inner side of the outer through hole 1321 . have. The outer through-hole 1321 and the inner through-hole 1322 may be alternately spaced apart from each other in the longitudinal direction D3 when viewed along the width direction D2. The outer through-hole 1321 and the inner through-hole 1322 may be alternately disposed to be spaced apart by a first interval and a second interval. Accordingly, one outer through-hole 1321 and one inner through-hole 1322 are located adjacently, and the other outer through-hole 1321 and the inner through-hole 1322 are located at a position spaced apart by a predetermined distance therefrom. As a result, the outer through-hole 132 may be disposed.

The number of the outer through-holes 132 may be less than the number of the central through-holes 131 . The sum of the areas of the outer through-holes 132 may be smaller than the sum of the areas of the central through-holes 131 .

In the first embodiment of the present invention, the width of the two outer portions A12 is 25% of the width of the distribution plate 13 , respectively, and the width of the central portion A11 is the width of the distribution plate 13 . 50%. In the first embodiment of the present invention, the number of the center through-holes 131 is twice the number of the outer through-holes 132 . In the first embodiment of the present invention, the sum of the areas of the outer through-holes 132 is 33.6% of the sum of the areas of the entire through-holes 131 and 132, and the sum of the areas of the central through-holes 131 is The sum of the areas of the through holes 131 and 132 is 66.3%.

4 is a view showing the shape of the distribution plate 13b of the burner according to the second embodiment of the present invention.

The shape of the distribution plate 13b of the burner according to the second embodiment of the present invention is different from the shape of the distribution plate 13 of the burner 10 according to the first embodiment in a specific size or the like. The remaining components of the water heater according to the second embodiment except for the shape of the distribution plate 13b of the burner according to the second embodiment are the same as described for the water heater 1 according to the first embodiment. have. Specifically, in the second embodiment of the present invention, the width of the outer portion A22 is 13.3% of the width of the distribution plate 13b, respectively, and the width of the central portion A21 is the width of the distribution plate 13b. of 73.4%. In the second embodiment of the present invention, the number of the center through-holes 131b is 5.5 times the number of the outer through-holes 132b. In the second embodiment of the present invention, the sum of the areas of the outer through-holes 132b is 15.4% of the sum of the areas of the entire through-holes 131b and 132b, and the sum of the areas of the central through-holes 131b is the total The sum of the areas of the through holes 131b and 132b is 84.6%. The number of rows of through-holes in the central portion A21 of the second embodiment is greater than the number of rows of through-holes of the central portion A11 of the first embodiment.

5 is a view showing the shape of the distribution plate 13c of the burner according to the third embodiment of the present invention.

The shape of the distribution plate 13c of the burner according to the third embodiment of the present invention is different from the shape of the distribution plate according to the first and second embodiments in a specific size and the like. Except for the shape of the distribution plate 13c of the burner according to the third embodiment, the contents described for the water heater 1 according to the first embodiment can be applied as it is to the remaining components of the water heater according to the third embodiment. have. Specifically, in the third embodiment of the present invention, the width of the outer portion A32 is 9.5% of the width of the distribution plate 13c, respectively, and the width of the central portion A31 is the width of the distribution plate 13c of 81.0%. In the third embodiment of the present invention, the number of the center through-holes 131c is 8.5 times the number of the outer through-holes 132c. In the third embodiment of the present invention, the sum of the areas of the outer through-holes 132c is 10.6% of the sum of the areas of all the through-holes 131c and 132c, and the sum of the areas of the central through-holes 131c is the total The sum of the areas of the through holes 131c and 132c is 89.4%.

That is, the width of the outer portions A12, A22, and A32 of the burner according to the embodiments of the present invention is 9.5% or more and 25% or less of the width of the distribution plates 13, 13b, 13c, respectively, and the central portion A11, The widths of A21 and A31 may be 50% or more and 81% or less of the widths of the distribution plates 13, 13b, and 13c. In addition, the number of center through-holes 131 , 131b and 131c of the burner according to embodiments of the present invention may be greater than or equal to 2 times greater than the number of outer through-holes 132 , 132b and 132c and less than or equal to 8.5 times. In addition, the sum of the areas of the outer through-holes 132, 132b, and 132c of the burner according to the embodiments of the present invention is the through-holes 131, 131b, 131c, 132, which are disposed in the distribution plates 13, 13b, and 13c. The sum of the areas of 132b and 132c) may be 10.6% or more and 33.6% or less. In addition, the sum of the areas of the center through-holes 131, 131b, and 131c of the burner according to the embodiments of the present invention is the through-holes 131, 131b, 131c, 132, which are disposed in the distribution plates 13, 13b, and 13c. 132b, 132c) may be 66.3% or more and 89.4% or less of the sum of the areas. The number of rows of through-holes in the central portion A31 of the third embodiment is greater than the number of rows of through-holes in the central portion A21 of the second embodiment.

6 is a view showing the shape of the distribution plate 13d of the burner according to the fourth embodiment of the present invention.

The shape of the distribution plate 13d of the burner according to the fourth embodiment of the present invention is different from the shape of the distribution plate according to the first to third embodiments in specific size and the like. Except for the shape of the distribution plate 13d of the burner according to the fourth embodiment, the contents described for the water heater 1 according to the first embodiment can be applied as it is to the remaining components of the water heater according to the fourth embodiment. have.

Referring to the drawings, the area of the outer through-hole 132d, which is a through-hole disposed in the outer portion A42, may be smaller than the area of the central through-hole 131d, which is a through-hole disposed in the center portion A41. Specifically, the width of the outer through-hole 132d along the width direction D2 may be smaller than the width of the center through-hole 131d along the width direction D2. A width of the outer through-hole located outside in the width direction D2 among the outer through-holes 132d may be smaller than a width of the inner through-hole located at the inner side.

7 is a view showing the shape of the distribution plate 13e of the burner according to the fifth embodiment of the present invention.

The shape of the distribution plate 13e of the burner according to the fifth embodiment of the present invention is different from the shape of the distribution plate according to the first to fourth embodiments in specific size and the like. Except for the shape of the distribution plate 13e of the burner according to the fifth embodiment, the content described for the water heater 1 according to the first embodiment may be applied as it is to the remaining components of the water heater according to the fifth embodiment. have.

Referring to the drawings, the area of the outer through-hole 132e, which is a through-hole disposed in the outer portion A52, may be smaller than the area of the central through-hole 131e, which is a through-hole disposed in the center portion A51. Specifically, the thickness of the outer through-hole 132e along the longitudinal direction D3 may be smaller than the thickness of the central through-hole 131e along the longitudinal direction D3. Among the outer through holes 132e , a width of an outer through hole positioned outside along the width direction D2 may be smaller than a width of an inner through hole positioned on the inner side.

8 is a view showing a shape in which the bracket engaging portion 1223f of the burner frame according to the sixth embodiment of the present invention covers the distribution plate 13 .

The water heater according to the sixth embodiment of the present invention is different from the water heater according to the first to fifth embodiments only in that a part of the bracket engaging part 1223f covers a part of the outer through-hole 132 . have. The content described for the water heater 1 according to the first embodiment may be applied to the remaining components of the water heater according to the sixth embodiment except for the shape of the bracket engaging portion 1223f according to the sixth embodiment. .

The width direction inner end of the bracket engaging portion 1223f of the burner frame may cover a portion of the outer through hole 132 that is a through hole disposed in the outer portion A12. An inner end of the bracket engaging portion 1223f in the width direction may cover at least a partial area of the outer through hole 1321 . The width direction inner end of the bracket engaging portion 1223f may cover a partial area of the inner through hole 1322 . Therefore, the overall area of the outer through-hole 132 may be reduced, and the bracket engaging portion 1223f may cover the outer through-hole 132 .

9 is a view showing a shape in which the shielding plate 90g according to the seventh embodiment of the present invention covers the distribution plate 13 .

The water heater according to the seventh embodiment of the present invention is different from the water heater according to the first to sixth embodiments only in that it further has a shielding plate 90g. As for other components of the water heater according to the seventh embodiment, the contents described for the water heater 1 according to the first embodiment may be applied as it is.

The water heater may include a shielding plate 90g. The shielding plate 90g may be formed of a material including stainless steel. The shielding plate 90g may cover a portion of the through hole adjacent to both ends of the distribution plate 13 in the width direction. The shielding plate 90g may be divided into two parts and disposed to be spaced apart from each other in the width direction D2. The shielding plate 90g may be coupled to the distribution plate 13 or may be coupled to and fixed to the bracket locking part 1223 .

That is, the shielding plate 90g may cover a portion of the outer through hole 132 that is a through hole disposed in the outer portion A12 . The shielding plate 90g may cover at least a partial area of the outer through hole 1321 . A partial area of the shielding plate 90g and the inner through-hole 1322 may be covered. Accordingly, the shielding plate 90g may cover the outer through-hole 132 to reduce the overall area of the outer through-hole 132 .

10 is a view showing a flame shape generated in the burner (B) using an exemplary distribution plate. 11 is a view showing a flame shape generated in the burner 10 according to the first embodiment of the present invention.

An exemplary case can be considered in which the number of through-holes is not adjusted and a distribution plate is used that is evenly arranged. When a flame F1 is formed through a combustion reaction using a burner B including an exemplary distribution plate, the flame F11 formed on the outside with respect to the width direction as shown in FIG. 10 is blown and formed very large and , may contact the sidewall of the combustion chamber and cause incomplete combustion as described above.

11 is an expression of the shape of the flame F2 that can be obtained when the distribution plate 13 according to the first embodiment of the present invention is used, which is formed outside based on the width direction D2 as compared with FIG. It can be seen that the flame has decreased. Therefore, the flame may not reach the part of the side wall 21 of the combustion chamber 20 in contact with the combustion chamber insulation pipe 51, and the problem of incomplete combustion that may be caused by the exemplary burner 10 is reduced and carbon monoxide generation is reduced. decreases and the efficiency of the water heater 1 can be increased.

In the above, even though all components constituting the embodiment of the present invention have been described as being combined or operated in combination, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all the components may operate by selectively combining one or more. In addition, terms such as "include", "compose" or "have" described above mean that the corresponding component may be inherent unless otherwise stated, so excluding other components Rather, it should be construed as being able to include other components further. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1: Water heater
10 : burner
11: mix chamber
12: fixed frame
13, 13b, 13c, 13d, 13e: distribution plate
14 : blower
20: combustion chamber
21: side wall
22: Eurocap plate
23: combustion chamber supply port
24: combustion chamber flange
30: sensible heat exchanger
31: sensible heat pin
32: sensible heat heat exchange pipe
33: heating water outlet
40: latent heat heat exchanger
50: insulated pipe
51: combustion chamber insulation pipe
52: sensible heat insulation pipe
60: adapter
61: adapter heat exchanger unit
62: adapter combustion chamber side
70: housing
71: heat exchange general side plate
72: heat exchange insulation side plate
73: heat exchanger flange
81: packing bracket
82: side plate packing
90g: blanking board
121: frame cover
122: frame bracket
131, 131d, 131e: center through hole
132, 132d, 132e: Outer through hole
200: combustion space
1221: bracket fixing part
1222: bracket connection part
1223, 1223f: Bracket locking part
1321: outer through hole
1322: inner through hole
A11, A21, A31, A41, A51 : center part
A12, A22, A32, A42, A52 : Outer part
B: Exemplary burner
D1 : Reference direction
D2: width direction
D3: longitudinal direction
F1, F2, F11 : Flame
P1 : Outer point
N1 : normal

Claims (17)

A burner for a water heater located upstream of a combustion chamber based on a reference direction that is a flow direction of combustion gas generated by a combustion reaction,
Comprising a plate-shaped distribution plate for causing the combustion reaction,
When one direction orthogonal to the reference direction is referred to as a longitudinal direction, and a direction orthogonal to the reference direction and the longitudinal direction is referred to as a width direction,
A plurality of through-holes formed by penetrating the distribution plate along the reference direction so that a mixture of fuel and air for the combustion reaction pass are disposed spaced apart along the longitudinal direction and the width direction,
The distribution plate includes a central portion that is a portion located at the center with respect to the width direction, and an outer portion located on both sides of the central portion,
The penetration density obtained by dividing the sum of the areas of the through holes located in the outer portion by the area of the outer portion is smaller than the penetration density obtained by dividing the sum of the areas of the through holes located in the central portion by the area of the central portion. According to claim 1,
The penetration density of the outer portion is 70% or less of the penetration density of the central portion, the burner. According to claim 1,
The width of the outer portion based on the width direction is smaller than the width of the central portion, burner. 4. The method of claim 3,
The width of the outer portion is 9.5% or more and 25% or less of the width of the distribution plate, respectively,
The width of the central portion is 50% or more and 81% or less of the width of the distribution plate. According to claim 1,
The number of through holes is
The number of through holes disposed in the outer portion is less than the number of through holes disposed in the central portion, the burner. 6. The method of claim 5,
The number of through-holes disposed in the central portion is at least 2 times greater than or equal to 8.5 times the number of through-holes disposed in the outer portion, the burner. According to claim 1,
wherein a sum of the areas of the through-holes disposed in the outer portion is smaller than a sum of the areas of the through-holes disposed in the central portion. 8. The method of claim 7,
The sum of the areas of the through-holes disposed in the outer portion is 10.6% or more and 33.6% or less of the sum of the areas of the through-holes disposed in the distribution plate,
The sum of the areas of the through-holes disposed in the central portion is 66.3% or more and 89.4% or less of the sum of the areas of the through-holes disposed in the distribution plate. According to claim 1,
The through hole disposed in the outer portion includes an outer through hole disposed at the outermost side in a width direction and an inner through hole disposed inside the outer through hole. 10. The method of claim 9,
The outer through-hole and the inner through-hole are alternately arranged to be spaced apart from each other in the longitudinal direction when viewed along the width direction,
The outer through-hole and the inner through-hole are alternately arranged to be spaced apart by a first interval and a second interval. According to claim 1,
An area of the through hole disposed in the outer portion is smaller than an area of the through hole disposed in the central portion. According to claim 1,
A width of the through hole disposed at the outer portion along the width direction is smaller than a width of the through hole disposed on the central portion along the width direction. According to claim 1,
The thickness of the through hole disposed in the outer portion along the longitudinal direction is smaller than the thickness of the through hole disposed at the central portion along the longitudinal direction. According to claim 1,
It further comprises a burner frame having an opening formed in the center, and both ends of the distribution plate in the width direction and the length direction are coupled to each other so that the distribution plate is disposed in a form in which the opening is closed by the distribution plate,
The inner end in the width direction of the burner frame covers a portion of the through hole disposed in the outer portion. According to claim 1,
The burner further comprising: a shielding plate formed of a material including stainless steel and covering a portion of the through-holes adjacent to both ends of the distribution plate in the width direction among the through-holes disposed in the outer portion. According to claim 1,
The distribution plate has a combustion region that is a region in which the combustion reaction occurs,
The combustion region has a profile formed convex downwardly in a cross section cut in a plane perpendicular to the longitudinal direction,
The combustion region is formed so that a normal line drawn at at least one of the two outermost points located on the outermost side in the width direction does not contact the inner surface of the combustion chamber. a burner having a mixing chamber in which fuel and air are mixed to produce a mixture, and a plate-shaped distribution plate in which the mixture is ejected to cause a combustion reaction;
a combustion chamber provided so that a flame generated by the combustion reaction is located therein;
a heat exchanger for heating water using heat generated by the combustion reaction; and
and a combustion chamber insulation pipe provided to allow water to flow outside the combustion chamber for thermal insulation of the combustion chamber,
When the direction in which the combustion gas generated by the combustion reaction flows is referred to as a reference direction, one direction orthogonal to the reference direction is referred to as a longitudinal direction, and a direction perpendicular to the reference direction and the longitudinal direction is referred to as a width direction. ,
A plurality of through-holes formed by penetrating the distribution plate along the reference direction so that the mixture passes through are spaced apart from each other in the longitudinal direction and the width direction,
The distribution plate includes a central portion that is a portion located at the center with respect to the width direction, and an outer portion located on both sides of the central portion,
The through hole formed in the outer portion is a side wall of the combustion chamber in which the outer end of the flame formed by the mixture passing through the through hole disposed in the outer portion based on the width direction is in contact with the combustion chamber insulation pipe. a water heater disposed to be located inside the portion.

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